In the Fantasy forum, there are two groups of Madden 12 players. XBox and PS3. The PS3 guys seemed to hang in there longer and I think are still going strong. You could recruit there, since that is where most of the folks would see this request:

The XBox Madden group also had a community. I was in it but withdrew because I am a flake. Anyway, you could check that link as well (couldn't find the Madden 12 thread, but here is one for Gamertags):